Printing-plate holder



(No Model.) F. HAINSWORTH.

PRINTING PLATE HOLDER.

No. 484,588. Patentd 008. 18, 1892.

77 awww UNITED STATES PATENT OFFICE.

PRINTING-PLATE HOLDER.

SPECIFICATION forming part of Letters Patent No. 484,588, dated October 18, 1892.

Application filed April 18,1890- Serial No. 343,481- (No model.)

.To all whom it may concern.-

Be it known that I, FREDERICK IIAINS- WORTH, a citizen of the United States, residing in the city of Chicago, in the county of Cook and State of Illinois, have made a certain new and useful Improvement in Printing-Plate Holders, of which the following is a specification.

Figure 1 is a plan view of section of bedplate with the electrotype-plate fastened and held thereon by means of my improved clamp. Fig. 2 is a vertical section through line 2 2 of Fig. 1. Fig. 3 shows details of the clamp.

The nature of this invention consists in making the clamp, as will bi i'nc'x' Lei-Jinafter.

A is the bed-plate, made of castiron or other suitable metal, in which are screw-holes B B in numbers sufficient to serve the purpose required.

C is the electrotype-plate, placed on the bedplate and firmly held thereon by the clamps O O and the stay-blocks D D. These stayblocks are made in any suitable form, preferably longer one way than the other, as shown in the drawings, and are fixedly attached to the bed-plate A alongside of the electrotype-plate by means of screws. The clamp O is made with one side E at right angles with the ends FE and the opposite side G oblique to all the other sides. This oblique side is beveled off, so as conform to the beveled side of the electrotype plate. The upper surface of the clamp is made in two different planes. One plane II is lower than the other plane I, thus forming a shoulder K between the two planes. Hence one part of the clamp is thinnerthan the "tl'cr. Thrt .igh the thinner part of the clamp is an elongated hole J, with sides parallel to the side E.

L is a cap made to rest on the surface of the thinner part H of the clamp and just sufficiently thick to have its upper surface come to the same plane of the surface I. (See Fig. 2.) It is provided with a countersunk hole M.

The elect-rotype-plate is placed on the bedplate A, with two sides adjoining the stayblocks D D,which have beveled edges to conform to the beveled edges of the electrotypeplate. A clamp is then placed with the oblique side against the side of the electrotype plate opposite one of the stay-blocks and fastened to thebed-plate by means of a screw N, passing through the cap L and through the elongated hole J of the clamp and into one of the screw-holes B in the bed-plate. As the clamp C is moved forward its oblique side presses against the edge of the electrotypeplate and clamps it against the stay-block on the opposite side. The screw N, being driven home into the countersunk hole in the cap L, holds the clamp lirmlyin position and fixedly locks the electrotype to the bed-plate, care at all times being taken that the upper surface of the clamp does not extend above the up persurface of the electrotype-plate. Another clamp is placed in a similar position on the remaining side of the electrotype-plate. As many of these clamps and stay-blocks can be used as is deemed necessary to firmly hold the electrotype-plate in position. I have stated that one side of the clamp is made at right angles with its ends. It is manifest that these angles can vary from a right angle and not depart from the spirit of my invention.

I claim- A clamp for holding electrotype-plates in position on bed plates in printingpresses,

having one edge at or near right angles with its ends, the remaining edge oblique to the other edges, one portion thereof thinner than the remainder, an elongated hole through the thinner part, and a cap provided with a countersunk hole on the thinner part, and means for fastening the same to the bed-plate.

FREDERICK I-IAINSW'ORTII.

Witnesses:

W. A. PHELPS, A. C. HIGGINS. 

